| 摘要 |
PURPOSE:To control conditions of charging, exposure and development, and to obtain a good image quality, by exposing a monitor pattern, as well, by a laser beam for exposing a picture, detecting a toner image of its pattern by an image quality sensor, and grasping its density and width. CONSTITUTION:A monitor pattern 33 is formed on a drum side part 32 by reading out a pattern data stored in a read-only memory 12, synthesizing it with a recording image signal, modulating a laser 1, and exposing a photosensitive drum surface 3. A reflection factor of a toner image of a monitor pattern obtained by developing said pattern by a developing device 5 is detected by a sensor 60, and toner image density and toner image line width are grasped from strength of a detecting pulse and pulse width, respectively. This monitor pattern information, and information of the photosensitive surface potential from a potential sensor 61 are analyzed by a microcomputer 6, and the condition for forming an image is controlled. |
